Temperature regulator



Fil'ed June 29, 1934 3 Sheets-Sheet l ffy.

Y Jnvenior: /I/erm am fands/o5;

SePt- 3, 1935- HfsANDvoss 2,013,480

TEMPERATURE REGULATOR Filed June 29, 1934 3 Sheets-Sheet 2 Jn venan- /yrmdnn/ fnde/05.5

Sept- 3; 1935- H. sANDvoss v2,013,480

TEMPERATURE REGULATOR v I v Filed June 29, 1934 3 Sheets-Sheet 5 Jn venan /79 rn-zn .Layla/ass it? Wy Patented Sept. 3, A1935 PATENT OFFICE TEMPERATURE REGULATOR Hermann Sandvoss, Frankfort-on-tbe-Mahn-- Osthafen, Germany Y Application June 29.1934, serial No. 133,135 In Germany July 24, i933 11 Claims.

'Ihis invention relates to a temperature regulator for steam plants, such as' steam-heated warm water and other boilers or similar appa- -ratus, in which the main valve regulating the supply of steam is controlled by a thermostatically actuated auxiliary valve adapted to connect the steam piping with a bellows member operating the closure of the mainvalve.v

The main feature of the invention is that the impulse space of the bellows member is connected with theante-chamber of the main valve in such a way that the accumulating water of condensation lls the impulse space and the connecting piping leading tothe auxiliary valve and the ante-chamberor inlet side of the main valve and indirectly transmits the steam pressure through the auxiliary valve to the operating bellows.

In this way, while making use of the unavoidthe working steam with the operating bellows or expansion tube and the auxiliary valve is eiectively prevented, as the water of condensation acts as interposed pressure transmitting medium and bars direct access of the steam tothese members. functions ina highly favorable manner as cooling medium whereby not only the life of the apparatus but also the operating accuracy thereof are increased. v

The impulse space with the auxiliary valve is preferably disposed below the main valve and the connecting pipings lead upwardly like risers.

Furthermore, the connecting piping leading v from the impulse space to the auxiliary valve and into the main steam piping may advantageously be provided with a, separate compensating vessel, inwhich the water level can always be balanced duringl successive valve motions so as to keep always sumcient water available for the transmission of pressure and for closing. The compensating vesseland the variousspaces of the temperature regulator may further be :Iitted the invention are illustrated in the accomparLving drawings, in which Figure 1 isa section cima temperature regulator according` to the inable condensate, direct and harmful contact of bore Il'of a cover I@ closing the casing '8. The water surrounding the latter' vention in connection` with a steam-heated boiler; Fig. 2, a, cross section on an enlarged scale of an auxiliary valve; Fig. 3, a cross section of a simplified constructions] embodiment of the invention; and Fig. 4, across section of a tempera- 5 ture regulator with a compensating vessel.

vReferring to the drawings, and rst to Fig. 1, I is the main valve for regulating the st supply and has an antecbamber or inlet or inlet side 2 which can be from the outlet side 10 3 of the valve I by a valve cone E cooperating with the valve passage 5. The arrows indicate the direction loiilow of the steam.

The valve cone 4 is connected by a rod E with an operating bellows which consists preferably i5 of a metal expansion tube. The operating bellows? is inanimpulse space 9 surrounded by a. casing 8. The lower end of the bellows 'l is secured tightly to a. bottom plate H disposed between the casing 8 and its bottom 20 closure I0. The upper free end of the operating bellows 'I is tightly shut od by an in curved -plate I2 acted upon by the valvev rod 6 which passes with slight clearance through a To 25 pack the bore I3 an on tube 1,5 is tightly secured withits upper endl to lthe cover I6 and with -its lower end, inserted in the yirnlvairdly curved plate I2.of the operating bellows to a lower closure I6 which is rmly connected with 3o the plate I2.

Between the main valve -I and the impulse space 9 an expansion tube or bellows I'i is. arranged in a space I9 enclosed by a casing t8., as shown-in Fig. 1. The bellows Il is provided at its lower 35 end with a tightly closing bottom plate 2li which is rmly connected with the valve rod 6. The upper end ofthe bellows il? is tightly to a cover 2| having a bose 22 for the-valve rod 6 which passes therethrough with slight clearance. 40 The internal width of the on tube Il corresponds to that of the valve passage' 5, so that the vvalve cone B is fully balancedv against prissure variations by the on tube il. The cover 2l is provided with a tubular attachment 45 23 to prevent the passage of impurities into the v expansion tube I1.

To increase the elasticity of the on tubos l, I5 and I'|a compression sprbig 25 adjustable by a spindle 24 may be'built intothe bottom I0. 50 'I'he compression spring 25 may be were with? i! the elasticityo! the on tubes l, Ii-anrl I'I suilces for counteractlng the developing in' the impulse space 9.

The mainvalve I isactuatedbythe p of the steam flowing through it, connection being either established'between the steam piping and located..

the impulse space 9 of the bellows 1 by meansof an auxiliary valve 26 or interrupted. The impulse space 9 of the operating bellows 1 is connected with the inlet side 2 of the main valve I in such a way that lthe accumulating water of condensation lls the space 9 and its connecting piping leading to the auxiliary valve 26 and the inlet side of the valve 2.

For this purpose' the impulse space 9 'and the auxiliary valve 26 are arranged below the main valve I, and the connecting piping 21 leading from the space 9 to the auxiliary valve 26 ascends and opens into the lower portion of the inlet side 2,-wliich. serves as a collectorv61.

To Apermit the water' of Icondensation to be forced into the impulse space 9 when the auxiliary valve 26 'is open to flow o after the closing of the valve 26, the impulse space 9 is connected by a'second ascending piping 28 with the outlet opens the ascending piping 28 'when closing the connecting piping 21.

Accordingv to Fig. 2, the ascending piping 28 contains a closing member which may consist of a freely movable check valve 3 I.

The auxiliary valvev 26 may be connected with` a thermostat 3 3 built into a boiler 32 and being or relatively small size by a capillary tube v34 whichtransmits the motions of the thermostat 33 to an operating member 35. The operating member 35 acts with its rod 36 on-the valve rod 31 of the double seat cone 30, which is`springloaded by the spring 38.

The temperature regulator as described functions as follows:

Assume that the main valve I is open and the heating steam flows. through fthe main valve I into the boiler 32. When the temperature of the water contained in the boiler 32 rises beyond the normal limit', say, one-half degree, the liquidl within the'thermostat 33 fitted with an adjusting scale 39, in the capillary tube 34 and the operating member 35 will expand. The operat-v ing member 35, by means off its rod 36, will then advance the rod 31 of the auxiliary valve 26 against the action of the spring 38, so that the double seat cone 30 opens. the connecting piping 21 and closes the ascending piping 28. y'I'he steam pressure prevailing in the inlet side 2 ofthe main valve I will then act indirectly by means of thel water contained in the connecting piping 21 Aand the impulse space 9 upon the plate I2 of the operating bellows 1 arranged in the impulse space 9 whereby the bellows 1 will be compressed. The plate I2 moves downand pulls down the valve rod 6 with the valve cone 4 of the main valve I, so that the cone 4 will close the valve-passage 5 and thus interrupt" the supply of steam to the boiler 32. The main'valve I remains closed while the water in the boiler 32 can cool down again to its normal temperature.

If the temperature of. the water falls below normal owing to-the shuttingoi of the steam supply, the liquid in the thermostat 33 will contract and the spring 38 of the auxiliary valve 26 the balancing bellows I1 is then pulls the double seat cone 30 back to its lower seat. This means vthat the connecting piping 21 is shut olf while the ascending piping 28 will be opened by the double seat cone 30.v However,v the-check valve 3| disposed'above the cone 30` will still keep the ascending piping 28 closedv until the pressure in the outlet side 3 ofthe main valve I will drop considerably, whereupon the checkyal-ve. 3| will be 'aspirated and the ascending piping 28 opened. The overpressure prevailing in the impulse space 9 will then cause `theexcess water to ow from the impulse space 9 through the auxiliary valve 26 into the ascending piping 28. Owing to the drop in pressure inthe impulse space 9, the operating bellows 1 will be expanded again by its own elasticity as vwell as by that of the other expansion tubes and the compression spring 25, and the plate I2 will then lift the valve cone 4 from its seat by means of the rod 6. The passage 5 of the main valve I '20 will thus be opened again, so that steam can space I9, so that the space I9 and the ascending piping 28 will always be filled with water. When the valve cone 4 closes the valve passage 5 and when a higher pressure is present in thevalve outlet 3, thispressure could maintain the valve cone 4 securely on its seat. By means of the compensating pipe 29 this is avoidedsince the pressure in the valve outlet 3 then operates through the pipe 28 and pipe 29 from underneath on thebottom 20 of the expansion tube, I1 and equals for this reason the pressure operating on the top of the valve cone 4.

The processes described are continually repeated as s oon as the temperature in the boiler 32 rises or drops. At uniform brisk operation the Jdouble seat cone 30 of the auxiliary valve 26 can equalize itself and keep open the pipings 21 and 28 to the same or a different extent, the valve cone 4 of the main valve I remaining in a certain intermediate position. -As the thermostat 33, 34, 35 has to actuate only the relatively small auxiliary valve 26, the apparatus operates easily and overloading -of, 'and damage to, the thermostat are prevented. For this reason the same type of thermostat can be used for mainvalves of different sizes. The main valve I always ltightly closed by steam pressure, andthe water servingl as pressure transmitting medium effectively prevents destruction of, and damage to, the expanslon tubes and the small auxiliary valve by the steam.

Fig. 3 shows a considerably simplified construction of the temperature regulator. The. main valve I is similar to that Lshown in Fig. l, but the operating and relieving bellows are combined into a single bellows 40 which is arranged in an impulse space 42 enclosed by the casing 4I. Similarly asin Fig. 1, this impulse space 42 communicates through a piping V43 and an auxiliary valve 44 with the inlet side 2 and also, through a piping 45 and a closing member, with the outlet side 3 of the main valvel I. The closing member is a throttle 46 whose adjustable closing body may be more or less screwed into the passage section of .the piping 45. 'Ihe valve cone 41 of the auxiliary valve 44, which opens or closes thepiping 43, is, as in Fig'. 1, controlled by the thermostat 33 by means of its operating member 35. l

- 'Ihe impulse bellows 4U, which in its capacity as relieving bellows communicates with its innel` space with the outer space 2 through the bore 48 inthe cover plate 49, which accommodates the valve rod 6, is tightly shut oil below by a bottom plate 50 firmly connected with the valve rod i. In thelower portion o! thecasing 4I a 54 and being secured to the casing 4i by a screw plug 56.

' The temperature regulator as described above with reference to Fig. 3 operates as follows:

When the temperature drops, theV valve conc 41 of the auxiliary valve 44 will be drawn down from its seat by the operating member of the thermostat 33, so that the auxiliary valve 44 is opened and the piping 43 also. The pressure in the inlet side 2, by means of the water contained in the piping 43 and the impulse space 42, causes compression of the impulse bellows 49 and lifts the bottom 50 with the valve rod 6 and the valve cone 4 against the action of the spring 5I which tends to draw the valve cone 4 to its seat. The main valve I is thus opened and steam can ow through the latter to the places to be heated until the temperature at the thermostat has again reached its normal height.

If the temperature Iat the thermostat 33-rises again, say, one-half degree, the valve cone 41 of the auxiliary valve 44 will be pressed again.

against its seat and thus the admission oi' the control pressure from the inlet side 2 to the imescape being regulated bythe position of the throttle member 46,. Pressure in the impulse space 42 will thus drop and the spring 5I draw the cone 4 of the main valve I toits seat', so that the passage 5 is throttled or shut oi! completely. Y On account of its simple construction, this regulator operates very accurately and is highly sensitive. It also costs less to manufacture.

The temperature regulator shown in Fig. A4 is, in its main parts, similar to the regulator shown in Fig. 1, though a special equalizing and collecting vessel 51 for water of condensation is intere posed between the inlet side 2 of the main valve I and the auxiliary valve 28 or the impulse space 9. This equalization vessel 51 may for instance consist of an oblong hollow body whose upper and lower connections 58 and B9 are Joined on both sides to the connecting piping 2 1, and a screwed joint 60 may be used for connecting.

Such an equalization vessel may also be interposed if necessary in the ascending piping 29 or at some other suitable point.

impulse space 9 and the space I9 with closable iilling connections 62 and 93.- These two spaces may further be provided with discharge connections s4 and 65 to facilitate the cleaning of these spaces.

The auxiliary valve ze is essentially or me seine cending piping 231s replaced by a throttle screw 66 arranged preferably in the valve body of the auxiliary valve 26 and adjustable according to the size of the apparatus and the working speed desired.

The-two bellows 1 and I1 and the two spaces 9 and I9 may of course be united to form a single bellows in a. single space, as shown in Fig. 3,. in which case the equalization vessel is disposed accordingly. At any rate, the spaces must always be arranged so that theyare lled with water of; condensation.

The mode of action of the temperature regulator according to Fig. 4 is as follows:

Assuming that the spaces 9 and I9 and the equalization vessel 51 are illled'with water. When the auxiliary valve 26 is then opened, the working steam in the inlet side 2 will press the water vout of the equalization vessel 51 into the impulse space 9 whereby the main valve I will be closed. The equalization vessel 51 can preferably take up at least the amount of water required for dis- `placlng the operating bellows in the impulse ing piping 28,.so that the main valve I will be opened. As the relieving bellows I1 will contract during this openingmotion, at least a portion of the water ilowing'through the ascending piping 28 will be drawn into the space I9 through the equalizing piping 29, so that this space, too, will alwaysbe tllled with water. Owing to continual condensation, the equalization vessel 31 will have become filled with water again in the meantime. Water of condensation can collect also `in the lower part of the inlet side 2, and after reopening of the auxiliary valve 2B the process described will be repeated.

.I claim:-

1. A temperature regulator for steam plants, comprising a main valve including an inlet side and an outlet side, a valve cone and a rod connected thereto, and a water condensate collector below and in communication with the inlet side of the valve; a casing forming an impulse space; an

. operating bellows in the impulse space and cooperating with the valve rod; and a thermostatically actuated auxiliary valve for controlling the main valve in pipe communication with the impulse space, the condensate collector and the outlet side of the main valve, the water of condensa.- tion collecting in the collector beingl adapted to fill upthe impulse space and the auxiliary valve to overcome the pressure of the steam in the inlet space acting on the operating bellows.

2. A temperature regulator for steam plants, comprising a main valve including an inlet side and a water condensaie collector below and in communication with the inlet side of the valve; a casing forming an impulse space; an. operating bellows ,in the impulse space; and a thermostatically actuated auxiliary valve for controlling the main valve in pipe communication with the impulse space and the condensate collector, the wa- `for controlling the main valve, an operating bellows actuating and arranged below` the main valve and having an impulse space, said impulse space being in pipe communication with the auxiliary valve and the latter` with the outlet side of the main valve and the piping leading through a closing member to the inlet sideof the main valve, said impulse space and piping when filled with accumulating water of condensation being adapted to indirectly transmit steam pressure through the auxiliaryvalve to the operating bellows, and an equalization vessel for the water of condensation interposed in the connecting piping leading from the impulse space to the outlet side ol the main valve. p

5. A temperature regulator for steam plants, comprising a main valve having an inlet side, a thermostatically actuated auxiliary valve for controlling the main valve, an operating bellows actuating and arranged below the main valve and v having an impulse space, said impulse space being in pipe communication with the auxiliary valve, an equalization vessel in communication with the inlet side of the main valve and in pipe communication with the auxiliary valve,said vessel, piping and impulse space when` lled with accumulating Water of condensation being adapted to indirectly transmit steam pressure through the auxiliary valve to the operating bellows, and a closable filling connection fitted to the equalization vessel. Y

6. A temperature regulator for steam plants, comprising a mainl valve having an inlet side, a thermostatically actuated auxiliary valve for controlling the mainvalve, an operating bellows actuating and arranged belo'w the main valve and .having an impulse space, said impulse space being in pipe communication with the auxiliary valve, an equalization vessel provided with a ll- A ing connection into'the inlet side of the main ing bellows, and a closable filling and discharging connection fitted to the impulse space of the operating bellows.,

7. A temperature regulator for steam plants,

4comprising a main valve having inlet and outlet sides, a thermostatically actuated auxiliary valve for controlling the main valve, an-operating bellows actuating the main valve and arranged below the main valve and having an impulse space, said impulse space being in pipe communication with the auxiliary valve and with the inlet side of the main valve, a check valve adjacent the auxiliary valve and in pipe communication with the outlet side of the main valve, said impulse space and its pipe connections when nlled with accumulating water of condensation being adapted indirectly to transmit steam pressure through the auxiliary valve to the operating bellows, and a double seat conel for the auxiliary valve adapted to open the connecting piping leading into the inlet side of the main valve when closing the connecting piping leading into the outlet side of the main valve and to close the connecting piping leading into the inlet side 4of the main valve when opening the connectingpiping leading into the outlet side of the main valve.

8. A temperature regulator for steam plants, comprising a main valve having inlet and outlet sides, a thermostatically actuated auxiliary valve for controlling the main valve, an. operating bellows actuating the main valve and arranged below the main valve and havingan impulse space,

said impulse space being inl pipe communication with the auxiliary .valve and with -the inletside of the main valve, an adjustable throttle member adjacent the auxiliary valve and in pipe communication with the outlet side of the main valve, said impulse space and its pipe connections when` filled with accumulating water of condensation being adapted indirectly to transmit steam pressure through the auxiliary valve to the operating bellows, and the inside of said operating bellows being in communication with the inlet side of the main valve to balance the valve cone of the main valve against pressure variations on the inlet side.

9. A temperature regulator for steam plants,

comprising 'a mainvalve having inlet and outlet sides, a thermostatically actuated auxiliary valve for controlling the main valve, an, operating bellows actuating the main valve and arranged below the main valve and having an impulse space, the inner space of said operating bellows being in communication with the inlet side of the main valve and said impulse space, and said impulse valve to the operating bellows, andan equalization vessel for the 'water of condensation interposedin the connecting piping leading from the impulse space to the inlet side of the main valve.

10. A temperature regulator for steam plants,

comprising a main valve having inlet and outlet sides, a thermostatically actuated auxiliary valve for controlling the main valve, an operating bellows actuating the main valve and arranged below the main valve and having an impulse space, said impulsespace being in pipe communication with theauxlliary valve and with the inlet sideof the main valve, a throttle member in `pipe communication with the outlet side of the main valve, said impulse space and its pipe connections when lled with' accumulating water of condensation being adapted indirectly'to transmit steam presv sure through the auxiliary valve to the operatingbellows, a bellows between -the inlet side of the main valve and the impulse space for balancing the valve cone of the main valve against pressure variations on the inlet side, a packing bellows for sealing aspace relative to the impulse space and in which the second-mentioned bellows is arranged, and an equalizing piping for connecting the last-mentioned space with the piping leading from the impulse space through the throttle member into the outlet side of the main valve.

11. A temperature regulator for steam plants,

comprising a main valve having inlet and outlet.

with the auxiliary valve and with the inlet side of the main valve, an adjustable throttle member in pipe communication with the outlet side oi the main valve, said impulse space and its pipe connections when illled with accumulating water of condensation being adapted indirectly to transmit steam pressure through the auxiliary valve to the operating bellows-a bellows between the main valve and the impulse space for balancing the cone of the main valve against pressure variations on the inlet side; a packing bellows for sealing a space relative to the impulse space and the throttlel member into the outlet side of the main valve, an equalization vessel tted with'a closable lling connection provided in the com necting piping leading from the impulse space through the auxiliary valve into the inlet side z of thev main valve.

HERMANN SANDVOSS. 

